gilbeet



(No Model.)

' H. J..GILBERT.

ROLLER MILL.

N0. Patented Apr. 24, 1883.

UNITED STATES PATENT OFFICE.

HENRY J. GILBERT, OF'RAOINE, WISCONSIN, ASSIGNOR OF ONE-HALF TO GEORGE A. GILBERT, OF SAME PLACE.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 276,238, dated April 24, 1883.

. Application filed October 27, 1882. (No model.)

To all whom it may concern:

Be it known that I, HENRY J. GILBERT, of Racine, in the county of Racine, and in the State of Wisconsin, have invented certain new and useful Improvements in Roller-Mills; and I do hereby declare that the followingis afull,

clear, and exact description thereof.

My invention relates to roller-mills; and it consists in devices for ridding the stock of its bran or fluff while on the way from the tail of each sieve to the grinding-surfaces of the rolls.

In the drawings, Figure l is a longitudinal section of a mill embodying my invention.

'Fig. 2 represents certain details of construcbetween the two series of rollers B B. The

other end of the pipes O carry sliding gates, by which they can be made to communicate with the open air. The face of each pipe 0 is slotted to forma communication along its entire length with a hopper, E. This hopper is shown in section in Fig. 2, and has a channel that leads from the pipe'O out over the grindin g-faces of the rollers B B and then down between them. It also has a flange, 0, for

guiding the fluff from the sieve in through a' passage, f. It also has another deflector, e, that prevents the stock from flying beyond, so that it must all pass through this hopper on its way to the rollers and be subjected to the draft made by the fan-blower, and this will carry all the fluff or branny matter out of the stock.

While a pipe 0 is joined to one end of each pipe 0 its other end has a port that leads to the open air and has guides to an, to rec'eivea sliding gate, 6, and when I find that the draft I through any one of thehoppers E is so strong that it carries the stock out, by opening this gate so as to'admit air from outside of the machine I can reduce the draft through the hopper. The guides to a a may be so arranged that the gate may slide horizontally, if desired:

I preferably provide the walls of the vertical channels of the hoppers with zigzag projections d, which serve to break the course of the stock as it falls so as to set the bran free.

I am aware that heretofore roller-mills have been provided with an air-trunk communicating with an exhaust-fan and with the rollers, and such I do not claim; nor do I claim such a trunk provided with a plurality of fans of different constructions, being aware that va rious suction devices have heretofore been employed in connection with roller-mills; but

What I claim as new, and desire to secure by Letters Patent, is-

1. In a roller-mill, the combination of the fan-blower D, located above the mill and between the two series of rollers B ]B, with the said rollers, the sieves, the hoppers E, slotted pipes G, and the independent pipes 0, each communicating with the upper central fanblo'wer, D, and with one of the slotted pipes G, substantially as set forth.

2. In a roller-mill, the combination of the fan-blower with the pipe O, slotted as shown, and terminating in the hopper E, having deflectors e and c and projections d, substantial] y as set forth.

3. The combinationof the central upper fanblower, D, with the sieves, rollers, the pipes G, and the pipes 0, connected at one end with the pipes O and provided at the other end with the gates b, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, on this 17th day of October, 1882, in the presence of two'witnesses.

HENRY J. GILBERT. Witnesses:

S. S. Srrour, H. G. UNDERWOOD. 

